Presentation on igmas FOR WORKING GROUP A International GNSS Monitoring & Assessment Service for OS (igmas) by Xurong Dong International Cooperation Research Centre, CSNO ICG 6 5 9 September 2011, Tokyo, Japan
Presentation overview 1. Background 2. The Scientific Research Activities on GNSS Performance Monitoring 3. igmas: Objective, Methods and Infrastructure 4. International Cooperation proposals on igmas 5. Concluding remarks
1. Background GNSS performance monitoring has become part of the work of ICG Working Group A key issues in the pursuit of better service provision Providers have agreed to consider proposals to widely monitor signals and service performance provide timely updates to users regarding critical performance characteristics e.g. timing, positioning accuracy and service availability[icg/pf/wp/sep2009,item 6,item7] igmas jointly proposed by co-chairs and ICRC of CSNO at the WG- A co-chairs intersessional meeting
igmas is complementary to IGS network etc. in terms of SIS quality and constellation status monitoring etc. essential to ensure the interoperability of OS signals able to promote service assurance and improve service performance useful to study on developing international standards of OS
In summary, igmas will benefit a lot for not only users to get assured open services with an unified standards. but also Providers to make their own GNSS system sustainable development
2. Scientific Research Activities on GNSS Monitoring A lot of scientific research work on GNSS monitoring and assessment have been done worldwide
2.1 BeiDou Monitoring and Assessment system In China In 2007, a BeiDou tracking network was established: with 6 tracking stations Urumqi Xi an, Changchun Kashi Lasa Lingtong Shanghai Kunming Sanya
Antarctic station Swans mountain
Analyzing center
. In Feb. 2009, the BeiDou signal quality monitoring system was built by National Time Service Center, Chinese academy of sciences Since April, 2009, this system have performed : signal quality monitoring and assessment for BeiDou GEOs and IGSOs successfully also collecting and analyzing GPS signals and Galileo Glove-B signals 7.3m antenna
2.2 Other research activities of GNSS signal monitoring At Stanford Univ.and DLR of Germany At Ohio Univ. Achievements also from other organizations such as a 3-station monitoring network established (with Chibolton observatory intermediate frequency sampling data) to monitor GPS signal anomalies in real time and to provide timely information to the public high-gain antennas to monitor GNSS signals
2.3 Multi GNSS Continuous Tracking Network IGS network with about 400 sites worldwide serving GNSS world raw data and products for many years Updating to Multi GNSS currently, M GEX recently proposed MGM net by JAXA designed with 60 sites Benefits of igmas were demonstrated and confirmed by above activities.
3. igmas: Tasks, Methods & Infrastructure 3.1 main ideas: to setup a global tracking network to monitor the Multi-GNSS open signal and service performance with not only Multi-GNSS geodetic receivers but also high gain omni-directional antennas, multi-beam antennas to share information to public 3.2 main tasks: to monitor multi-gnss SIS, constellation status, navigation data, and serice performance to contribute to IGS and MGM network by co-location and data sharing To serve GNSS world with data, products, information To evaluate the parameters for interoperability
The elements for Monitoring and Assessment of GNSS Constellation status SIS Navigation data Service performance Number Number of of inorbit inorbit satellites satellites Time Time domain domain characteristics characteristics Message Message validity validity Accuracy Accuracy Orbit Orbit distribution distribution Status Status of of each each satellite satellite Constellation Constellation DOP DOP Frequency Frequency domain domain characteristics characteristics Modulation Modulation domain domain characteristics characteristics Correlation Correlation domain domain characteristics characteristics Ionosphere Ionosphere delay delay GNSS GNSS time time bias bias Validity Validity of of Tgd Tgd Availability Availability Integrity Integrity Continuity Continuity
3.3 Infrastructure of of igmas Communication satellite GPS GLONASS BeiDou GALILEO Satellite communication Internet Ground tracking network Data Center Satellite communication Internet Analyzing Center Users
four main components: The basic functions modules of igmas include: 1)Data monitoring and collecting 2)Data communication 3)Data store 4)Data analyzing and information release
3.4 igmas s Complementary aspects to to IGS & MGM networks Common points Complementary igmas IGS network dealing with OS signals tracking Multi GNSS signals based on int. cooperation providing data and product sharing information etc. MGM net Mainly Co location with IGS.MGM stations code + carrier+sis quality+constellation status etc. providing RINEX formatted data to the IGS in support of its multi GNSS project
3.4 igmas s Complementary aspects to to IGS & MGM networks igmas IGS MGM net network Data and products sharing with IGS, etc. Precise ephemeris, clocks PM parameter. Station coordinates, velocities Constellation status monitoring Navigation signal power anomalies navigation data monitoring etc
4. International Cooperation proposals on igmas 4.1 cooperation issues regarding igmas Recommendations: to set up a technical working group or subgroup to deal with issues of igmas To optimize existing and planed capabilities To identify additional activities,and operational models To deal with the technical things regarding igmas, such as: OS Performance parameters, elements for monitoring, information sharing, jointly setting up stations, etc.
4.2 recent activities suggested for the TWG A workshop scheduled during Vienna meeting in Dec. to receive valuable inputs to igmas from Providers to user community, academic organizations and manufacturers etc. to give Providers, industry, and user communities the chance to provide their views on igmas
International BeiDou/GNSS demostration Campaign is recommended(initial service in Asia and Pacific region) to test and demonstrate the capabilities of BeiDou/GNSS systems to provide an opportunity to develop potential new GNSS applications enabled by BeiDou/Multi GNSS systems. order to contribute to the above campaign activities. Other All sites will be required to make available RINEX
6. Concluding remarks 1. igmas is beneficial to all sides: for the Providers improving their own system, for users, enterprises, academic organizations etc. 2. igmas is complementary to IGS and MGM net etc. 3. igmas is a long term work, needing international cooperation A TWG or subgroup needed. All sides encouraged to take part in this group
Thanks for your attention. Dr. Xurong Dong International cooperation research center, China Satellite Navigation Office tel.: +86-10-88102315 fax. +86-10-88102328 email: dongxr@beidou.gov.cn ; rongerdx@163.com
Mandatory requirements: for igmas station selection tracking stations installed with high-gain antennas should meet 1-overlap coverage to satellites at least; those tracking stations for SIS monitoring should meet 4-overlap coverage to satellites; Intended number of sites : 30 at least, Mainly Co-location with IGS.MGM stations Provision of RINEX formatted data to the IGS in support of its multi-gnss project.